Strength grades

8.8 - 10.9 - 12.9 - 14.9,
others on request

Types of processing

drop-forging, turning, milling,
drilling, interior and exterior spaces,
burnishing, thread rolling

Heat treatments

tempering, normalising, surface-
hardening (inductive and in use), hydrogen annealing

Surface coatings

galvanising, mech. galvanising, hot-dip galvanizing, zinc-lamella coating, zinc-iron coating, ion nitriding, copper plating, phosphating, chrome plating, chromating

Our production program
at a glance

DIN screws

We manufacture DIN screws as a hot-pressed version.

Thread: M16 - M64
Shaft length: 35 - 500mm

Hex bolts

Hex bolts			DIN 931, 933, 960, 961 ISO 4014, 4017
Hex head bolts with large wrench size			DIN 6914
Hex head bolts with coned or half dog point			DIN 561, 564
Hexagon fitting bolts			DIN 609, 610, 7968
with a thin shaft			DIN 7964
HVP screw with large SW and body-fit			Combination DIN 6914/7968

Cylinder bolts

Hexagon socket head cap screws			DIN 912, ISO 4762
Hexagon socket head cap screws with low head and key guide			DÜRHOLT factory standard = DIN 6912
Internal toothed socket head cap screws with low head and key guide			DÜRHOLT factory standard CV 84
Flat hexagon socket head screws			DIN 7991
Hexacon socket head cap screws with low head			DIN 7984